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我们采用硫氰酸盐差示比色法测定高温合金及高速工具钢中高钨的含量,着重研究了参比溶液的选用。认为当参比溶液与被测溶液含钨量相差2～10%时,所得曲线均符合比耳定律。对于共存元素的干扰,铌以草酸络合掩蔽,钼、钒、铜、铁、镍、铬均采用抵销法予以消除。本法适用于5～30%的钨的测定。一、试验方法称取试样0.1克,置于150毫升烧杯中,加入20～30毫升不同比例的盐、硝混合酸,
We use thiocyanate differential colorimetric determination of high-temperature alloys and high-speed tool steel high tungsten content, focusing on the selection of the reference solution. That the reference solution and the measured solution of tungsten content difference of 2 ~ 10%, the curves are in line with Beer’s law. For the interference of coexisting elements, niobium is masked by oxalic acid complexation, and the elimination method is adopted for the molybdenum, vanadium, copper, iron, nickel and chromium. This law applies to the determination of 5 to 30% of tungsten. First, the test method Weigh the sample 0.1 grams, placed in a 150 ml beaker, add 20 to 30 ml of salt, nitrate mixed acid,